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Invasive Species Management

Giant salvinia is a floating aquatic plant prohibited in the United States by Federal Law. Giant salvinia grows rapidly and forms thick mats which crowd out other vegitation, degrade water quality, and impede recrational access. Giant salvinia poses a serious threat to all water bodies in East Texas.

The U.S. Army Corps of Engineers (USACE) is the steward of 12 million acres of public lands and waters at hundreds of water resources projects nationwide. In the efforts to conserve, protect and restore these lands and waters it is necessary to manage and control invasive species. Invasive species can be plants, animals and other organisms. They threaten our nation’s natural resources; seriously hinder navigation; adversely affect flood risk management, hydropower generation and water supply; and limit recreation use by the public.

To manage the threat of these species, USACE employs the latest economically efficient technologies and research; and biological, mechanical and chemical control methods. USACE also stays on the leading edge of invasive species management by developing new pest control techniques through its Aquatic Nuisance Species Research Program and Aquatic Plant Control Research Program. These efforts and the development of bio-control agents, new use patterns for aquatic pesticides, barrier systems, and innovative pesticide application techniques by USACE researchers and their partners are making a difference in the fight against invasive aquatic species nationwide.

Due to ever-changing ecosystems and the emergence of new and spreading species, the monitoring and management of invasive species will remain a continuous challenge for USACE and its partners.

Zebra Mussels

TPWD Executive Order 12-003:
Zebra Mussels in the Elm Fork tributary of the Trinity River.

The Executive Director of the Texas Parks and Wildlife Department finds that zebraZebra Mussels mussels ("Dreissena polymorpha") present an immediate danger to aquatic species regulated by the department and hereby ORDERS the adoption of emergency rules to contain zebra mussels in all impounded and tributary waters of the Elm Fork of the Trinity River upstream from the Lewisville dam. The Executive Director authorizes the immediate submission of Notice of Emergency Rulemaking in the "Texas Register".

PDF FileExecutive Order No. 12-003
PDF FileNotice of Emergency Rulemaking
PDF FileZebra Mussels - Fact Sheet
External WebsiteZebra Mussels - TexasInvasives.org
External WebsiteReport Zebra Mussels - TexasInvasives.org
PDF FileZebra Mussels - Tri-Fold Brochure
PDF FileZebra Mussels - Wallet Card
PDF FileZebra Mussel Resource Document - Trinity River Basin, Texas